2200 fps would be my best guess. Be very cautious about reduced loads.
When you have excess air space in a cartridge, you can run into a very dangerous condition.
I believe it is called Secondary Explosion Effect. The excess space combined with a slow powder, can cause the primmer to ignite the surface of the powder charge all at once. Can create extreme pressures with no warning.
If you get hangfires / delayed ignition, you need to re evaluate your load.
A better choice for reduced loads is a small charge of fast powder like trail boss, or google red dot for subsonics.
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